Homogeneous
Instant coffee in water is a homogeneous mixture, meaning it has a uniform composition throughout. The coffee particles are fully dissolved in water, resulting in a consistent mixture.
Water and instant coffee is a homogeneous mixture, specifically a solution, because the instant coffee particles dissolve evenly in the water forming a uniform mixture. It is not an element, as elements are pure substances made up of only one type of atom.
Coffee isn't a compound. Coffee is a mixture.
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Instant coffee dissolves very quickly in hot water.
Coffee is a heterogeneous mixture. Its main composites are water and refined coffee beans which can be mechanically separated.
A black coffee with sugar would be a solution, as the sugar dissolves completely into the coffee. However, the coffee itself is a mixture of water, coffee beans, and other compounds, making it a homogeneous mixture. Pure substances only have one type of molecule or atom in them, so coffee and sugar are both mixtures.
Instant coffee is pre brewed coffee ready to rehydrate with boiling water. It dissolves and is ready to drink with no residue. Filter coffee is ground roasted beans through which you pour boiling water and the liquid is passed through a filter leaving only the fresh brew. The grounds stay trapped in the filter.
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Part of the reason is due to the type and quality of coffee beans used to make instant coffee. It is similar to the fact that the eggs you buy the supermarket are at least grade A, but the eggs used to make dried eggs, egg whites, pasteuized eggs are usually lesser grade eggs. This lowers the cost of producing these egg products.
Blackcoffe is a pure substance
Well that's a good question actually, coffee is a liquid not a solid because liquids are like a type of water based fomula or something that you could or would drink. And, solids are like things that you can hold, feel, wear, ect.